28515828 has 72 divisors (see below), whose sum is σ = 75075840. Its totient is φ = 8412800.

The previous prime is 28515811. The next prime is 28515829. The reversal of 28515828 is 82851582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28515829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59293 + ... + 59771.

It is an arithmetic number, because the mean of its divisors is an integer number (1042720).

Almost surely, 2^28515828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28515828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37537920).

28515828 is an abundant number, since it is smaller than the sum of its proper divisors (46560012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28515828 is a wasteful number, since it uses less digits than its factorization.

28515828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 536 counting only the distinct ones).

The product of its digits is 51200, while the sum is 39.

The square root of 28515828 is about 5340.0213482719. The cubic root of 28515828 is about 305.5122735731.

The spelling of 28515828 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred twenty-eight".